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> With electricity spot market, this sort of money is around

This happens precisely because of supply-demand - peak dispatchable bulk generation is more expensive. VtG brings a lot of cheap supply bringing prices down and causes balancing stress on distribution grid, increasing distribution costs. 5x sounds like an absolute pipe dream

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The price level would be determined in the market of course, maybe most vehicle owners would be ready to participate with lower reimbursement ratio. Anyway, I doubt this would cause a lot of stress to the distribution grid as the vehicle batteries are probably closer to the loads than the large scale power stations. The EVs powering neighbourdhood ACs and so on. So at least the distribution transformers could easily see lower load than without V2G.

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